Defensive publication



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969. S69 0.6. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification, including claims and sheets ofdrawings contained in the application as originally filed. The flles ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a. sheet.

Defensive Publication applications have not been examined as to themerits or alleged invention. The Patent Oflice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED AUGUST 18, 1970 T877,001 ETHYLENE/ VINYL ACETATE COPOLYMERWATER RESISTANT ADHESIVES Bert Sorelle Gorton, Kennett Square, Pa.,assignor to E. I. du Pont de Nemours and Company, Wilmington, Del., acorporation of Delaware Filed May 28, 1969, Ser. No. 828,768 Int. Cl.C08f 3/56; C08g 9/10 US. Cl. Mil-29.4 No Drawing. 11 Pages SpecificationThe water resistance of adhesives of ethylene/vinyl acetate copolymeremulsions using polyvinyl alcohol as a protective colloid is improved bythe addition of dimethylol urea or a mixture of urea andparaformaldehyde. The addition of an alcohol, such as methanol, preventscoagulation and gelling of the emulsion. An adhesive emulsioncomposition usually comprises a copolymer of 35 to 12 weight percentethylene and 65 to 88 weight percent vinyl acetate, 4 to 6 weightpercent, based on copolymer weight, of a polyvinyl alcohol protectivecolloid, the polyvinyl alcohol being present during the formation of thecopolymer, 6 to 10 weight percent dimethylol urea (01' otherurea-formaldehyde adducts) and 3 to 8 percent methanol. The adhesivesare useful for bonding porous and non-porous substrates such as film,paper, cloth and leather. Thus, they can be used in preparing articlessuch as cartons, bags, cups, labels and tubes. They are particularlysuitable for use in applications where exposure to moisture is likely.Fillers, pigments, dyes and other additives can be used in the adhesive.

